| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com> |
| Cc: | "Andrey M(dot) Borodin" <x4mmm(at)yandex-team(dot)ru>, MBeena Emerson <mbeena(dot)emerson(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Andres Freund <andres(at)anarazel(dot)de>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Stephen Frost <sfrost(at)snowman(dot)net> |
| Subject: | Re: recovering from "found xmin ... from before relfrozenxid ..." |
| Date: | 2020-08-03 13:35:49 |
| Message-ID: | CA+TgmoYhjR4ZjVMtAhjsX+FD2-vCPnswv6+MdN=ANObNNMdn6A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Aug 3, 2020 at 5:05 AM Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com> wrote:
> Could you please explain this point once more in detail? I am not quite able to understand under what circumstances a buffer would be modified, but won't be marked as dirty or a WAL won't be written for it.
Whenever this branch is taken:
+ if (nskippedItems == noffs)
+ goto skip_wal;
At this point you have already modified the page, using ItemIdSetDead,
HeapTupleHeaderSet*, and/or directly adjusting htup->infomask. If this
branch is taken, then MarkBufferDirty() and log_newpage_buffer() are
skipped.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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